CVE-2020-8807
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedIn Electric Coin Company Zcashd before 2.1.1-1, the time offset between messages could be leveraged to obtain sensitive information about the relationship between a suspected victim's address and an IP address, aka a timing side channel.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceZcashd before version 2.1.1-1 contains a timing side-channel vulnerability in its peer-to-peer messaging layer. The time offset between network messages can be measured by adversaries to correlate a suspected victim's Zcash address with their IP address, enabling deanonymization attacks against users.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 2.1.1CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Determine installed zcashd versionRun `zcashd --version` or check the version string in the daemon logs (typically in ~/.zcash/debug.log)Affected if The reported version is below 2.1.1-1 (e.g., 2.0.0, 2.1.0, etc.)
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Verify zcashd daemon is runningCheck for running zcashd process using `ps aux | grep zcashd` or `systemctl status zcashd`Affected if The daemon is actively running and connected to the Zcash network, exposing the timing side-channel to network peers
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Confirm peer-to-peer networking is enabledCheck zcash.conf for `listen=1` (default) or verify that the node has active connections via `zcash-cli getpeerinfo`Affected if P2P listening is enabled (the default), allowing external peers to measure timing offsets of network messages
If zcashd version is below 2.1.1-1 and the daemon is running with P2P networking enabled, the environment is affected by the timing side-channel vulnerability.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor data2.1.1
Upgrade Zcashd to version 2.1.1-1 or later, which includes timing obfuscation countermeasures. Consider additional network-level protections such as Tor or VPN usage for heightened privacy requirements.
- Consultation6.0 h
- Implementation12.0 h
- Testing6.0 h
- Review / QA4.0 h
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2020-8807 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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